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Lu$^+$ optical frequency references with accuracy verified at the 19th digit
We report a comprehensive evaluation of all known sources of systematic uncertainty for two independent $^{176}$Lu$^+$ single-ion optical references, finding total systematic uncertainty of $1.2\times10^{-19}$ and $1.3\times10^{-19}$ for the two individual systems and $1.0\times10^{-19}$ for the dif
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